Electric lamp and discharge devices: systems – Current and/or voltage regulation
Reexamination Certificate
2008-07-08
2008-07-08
Vu, David H (Department: 2821)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
C315S149000, C315S157000, C315S158000, C315S159000
Reexamination Certificate
active
07397202
ABSTRACT:
A brightness control circuit is used to control brightness of a light emitting module. A light sensor module generates a first current through itself according to a light intensity. A charging module is coupled between the light sensor module and the ground, and generates a charging voltage at a voltage node according to the first current. A voltage control circuit comprises a reference voltage source, a comparator and a diode. The reference voltage source provides a reference voltage. The comparator has a non-inverse input terminal coupled to the reference voltage source, an inverse input terminal coupled to the voltage node, and an output terminal. The comparator outputs a comparative signal according to the reference voltage and the charging voltage. The diode is coupled between the inverse input terminal and the output terminal. The switch is coupled to the voltage control circuit and provides a second current through the light emitting module according to the comparative signal.
REFERENCES:
patent: 6538394 (2003-03-01), Volk et al.
patent: 7245090 (2007-07-01), Yang
Asia Optical Co. Inc.
Thomas Kayden Horstemeyer & Risley
Vu David H
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